Circular glass-cutter.



' anus/urea Patented June I7, I902.

n; B. JOHNSON. CIRCULAR GLASS CUTTER.

(Application filed Sept. 25, 1901 (No ModeL) Q/vi l'neooca v I UNITEDSTATES:

FPATENT- OFFICE;

DAVID B. JOHNSON, AMBLER, PENNSYLVANIA.

cmcu LAR cL ssycuTTsn.

SPECIFICATION forming part of Letters Para Ne. 702,732, dated 1...; 17,1902. Application file'd $eptember 25,1901. sealant. 76,508. (No model.)

i To all whom it may concern:

Be it known that 1, DAVID B. JOHNSON, a cltizen of the United States,residing at Ambler, county of Montgomery, State of Penn- '5 sylvania',have invented a new and useful, Improvement in Circular Glass-Cutters,offj which the following is a specification.

' My invention consists of an improvement in circular glass-cutters,aswill be hereinafter 16 described and having the novel features pointedout in'the claims.

Figure 1 representsaperspective view of. a

cutter constructed in-accordance with my invention. Fig.2 represents ahorizontal section' thereof, taken on line mm, Fig. 3. Fig. 3

represents a vertical section thereof, takenon;

line y y, "Fig. 2. I

Referringtothe drawings, A designates a circular glass-cutterc'omprisingahandle B,

, o from the lower end of 'whichextends a shank 0, provided at its lowerend with the base D.

The under face of said base D is provided with a centering plate or padE, of leather or analogous material, that aifords the requisitefrictional contact with the surface of the glass to enable the cuttertobe readily held against the same while being operated. Freely mountedupon the shank Ois the block F, the height of which is a-little lessthan the distance between the end of the handle B and the adjacent sideof the base D, said block being provided on one side with a guidegrooveG to receive thearm H, carrying the cutter J, the latter being securedto one end" 3 5 of the arm and being provided with a swi'v-,

eled finger-piece or knob K, by'meansof which it is rotated. The axis ofthe cuttingwheel J of the cutter J 'is'situated 'inya' ver tioal planeof a radius from the shank 0,

40 around which it revolves, to insure a clean said slot L registeringwith said guide-groove G. 'The end' of thebolt is screwr'th'readed andextends beyon'dthe side of the'block, where it is provided with athumb-nut P, whose bearing is against said block, so that when the boltis tightened the head of the bolt causes the arm H to be gripped by thewalls of the slot L and guide-groove G, it

being noted that said bolt is provided with an elongated opening Q,through-which the shank; C passes freely. By loosening the thumb-nut Pthe grip upon the arm is released, so'that the said arm can be movedflongitudinally to regulate the radius at which th'etool willcut, afterwhich byagain tighteningthe' thumb-nut P the arm is securely held inlitsposition. i

It will be seen that when the device is placedQon a'piece of glass andheld firmly thereagainst by the handle Bthe cutter is rotated bythe-handle orknob K, the block F freely rotating around the shank C,said out-- .terbeing pressed against the glass, and thus making acircular cut in the latter.-

Having thus described myinvention, What I claim as new, and desire tosecure by Letters Patent, is-- 1. In a circular-glass-cutter, arotatable block, a bolt having a headfitted to slide in saidblock,-abase, a shank passing freely through said block, andhead,ahandle on said shank, and a cutter-carrying arm-ad- 'justably fitted ina slot in said head, said block having a groove in its, side inregister' with said slot of the bolt-head. i

2. A circular glasscutter, comprising a handle, a shank extendingtherefrom,'a base upon the said 'shankfafrictionalcenteringplate uponsaid base,a cutter rotatably' mountedupon said shank, a block mounted onsaid shank, avbolt having it's head adapted to slide inf said blo'ck,and a cutter-carrying arm adljustably fitted in said head and adapted tobecarried by said head against said block,

said-bolt and block having openings for the p s e f rlfiha 'the eih g t-3.jjA -circular glass-cutter, comprising a handle having acentering-plate connected therewith by a shank, a rotatable blockmounted upon said shank, and provided in its side with a guide-groove,an arm adjustably secured in said groove and providedwith aglass-cutter, a boltyhavinga head adapted to slide in said block andprovided'witha slot in which said arm is adj ustably received,fsaid 4:.A circular glass-cutter, comprising a handle having a centering-plateconnected therewith by a shank, a block rotatably mounted upon saidshank and provided with a guide-groove, a bolt passing through saidblock and having a slot registering with said guide-groove, a thumb-nutupon said bolt adapted to engage said block, and an arm passing throughsaid guide-groove and slot and provided with a glass-cutter.

5. A circular glass-cutter comprising a handle, a shank, acentering-plate, said shank connecting said handle and plate, alongitudinally-moving arm having a cutter, said arm being rotatablymounted on said handle, a block mounted on said shank, a bolt having itshead adapted to slide in said block, said arm being passed through aslot in said head, and said shank passing freely through

